What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 19203-9: Free PSA [Moles/Vol]

Name: LOINC Code 19203-9: Free PSA [Moles/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-25T17:13:11.347Z

19203-9 is a LOINC code used to identify Free PSA [Moles/Vol] in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Prostate specific Ag.free. It is commonly used with the system or sample type Ser/Plas.

Reviewed by HealthAssure Clinical TeamUpdated 25 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component Prostate specific Ag.free. It is commonly used with the system or sample type Ser/Plas.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Both

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Prostate Specific Ag Free [Moles/volume] in Serum or Plasma
Prostate specific Ag.free
Chemistry; fPSA; FR; Genitourinary; GU; Kallikrein 3; Level; Non-protein bound; Oncology; P-30 antigen; Pl; Plasma; Plsm; Point in time; PS; PSA; PSA Free; QNT; Quan; Quant; Quantitative; Random; Seminin; SerP; SerPl; SerPlas; Serum; Serum or plasma; Spec; SR; Substance concentration; Tumor marker; URO; Urology

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Related SNOMED CT concepts

705114005SNOMED CT mapping for Free PSA [Moles/Vol] (19203-9)

Related observations and tests

SNOMED_CT 705114005high

LOINC Code System

Source: LOINC-SNOMED cooperation package

Common synonyms

Free PSA [Moles/Vol]Prostate Specific Ag Free [Moles/volume] in Serum or PlasmaPSA Free SerPl-sCncProstate specific Ag.freeCHEMFree PSA, BloodSCnc

Frequently asked questions

Code details

Code19203-9

SystemLOINC

Display nameFree PSA [Moles/Vol]

DescriptionProstate specific Ag.free

Short namePSA Free SerPl-sCnc

ComponentProstate specific Ag.free

PropertySCnc

TimingPt

System (specimen)Ser/Plas

ScaleQn

ClassCHEM

Example unitsumol/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0l

Last changed2.40

Consumer names

Free PSA, Blood

Part names

Prostate specific Ag.freeSCncPtSer/PlasQnProstate Specific Ag FreeSubstance ConcentrationPoint in time (spot)Serum or Plasma

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.